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Mammoth Gray Stripe Sunflower

A Tasty Treat


Enormous yellow flowers measure 14 in. across and yield a whopper crop of seeds! High oil content makes for great roasted flavor. Grows 9-12 ft. tall. 100 DAYS.
  • Zone 3 - 9.
  • Height 9 - 12 feet.
  • Germination 10 - 14 days at 68 - 86 degrees F.
  • Shade Required Full Sun.

This item ships in both Spring & Fall

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  • 14681
  • 1 oz.
  • $2.99
  • 14682
  • 1/4 lb.
  • $6.99
  • Product Details
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  • Ratings & Reviews

Product Details

  • Botanical Name: Helianthus annuus 'Mammoth Gray Stripe'
  • Height: 9 - 12 feet.
  • Spacing: 2 - 4 feet.
  • Depth: 1 inch.
  • Spread: 15 - 24 inches.
  • Sun/Shade: Full Sun.
  • Color: Orange-yellow.
  • Foliage: Very rough; to 1 foot long heart shaped green leaves.
  • Blooms: July - September.
  • Days To Maturity: 100 days.
  • Form: Annual.
  • Flower Form: Bright yellow flowers up to 20 inches in diameter.
  • Soil Requirements: Light, well-drained, dry soil.
  • Growth Rate: Medium growth rate.
  • Seed Count: Approximately 300 seeds per one ounce. 1/4 lb. is approximately 1200 seeds. Sold by weight.
  • Size: 8 - 14 inch flowers.
  • Comments: Will do well in poor soil. Tolerates heat and dry conditions. Average head size is 10 - 15 inches, but have reached 20 inches. Extremely large heads on 9 - 12 foot stalks.

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